package com.star.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.star.constant.MessageConstant;
import com.star.context.BaseContext;
import com.star.dto.*;
import com.star.entity.*;
import com.star.exception.AddressBookBusinessException;
import com.star.exception.OrderBusinessException;
import com.star.mapper.*;
import com.star.result.PageResult;
import com.star.service.OrderService;
import com.star.utils.WeChatPayUtil;
import com.star.vo.OrderPaymentVO;
import com.star.vo.OrderStatisticsVO;
import com.star.vo.OrderSubmitVO;
import com.star.vo.OrderVO;
import com.star.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.*;
import java.util.stream.Collectors;


@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WebSocketServer webSocketServer;
    @Autowired
    private BusinessMapper businessMapper;

    // 客户端
    /**
     * 订单搜索
     * @param ordersPageQueryDTO
     * @return
     */
    public PageResult pageQuery(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);
        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                // 商家名称
                Business business = businessMapper.getById(orders.getBusinessId());
                String businessName = business.getName();
                orderVO.setBusinessName(businessName);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 查询订单详情
     * @param id
     * @return
     */
    public OrderVO businessOrderDetail(Long id) {
        // 查询订单表基础数据
        Orders orders = orderMapper.getById(id);
        if(orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        if(!Objects.equals(orders.getBusinessId(), BaseContext.getCurrentId())){
            throw new OrderBusinessException(MessageConstant.NOT_PERMISSIONS);
        }

        Long businessId = orders.getBusinessId();
        Business business = businessMapper.getById(businessId);
        String BusinessName = business.getName();

        // 查询订单详情表数据
        List<OrderDetail> orderDetailList = orderDetailMapper.getById(id);
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setBusinessName(BusinessName);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /**
     * 查询订单详情
     * @param id
     * @return
     */
    public OrderVO adminOrderDetail(Long id) {
        // 查询订单表基础数据
        Orders orders = orderMapper.getById(id);
        if(orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        Long businessId = orders.getBusinessId();
        Business business = businessMapper.getById(businessId);
        String BusinessName = business.getName();

        // 查询订单详情表数据
        List<OrderDetail> orderDetailList = orderDetailMapper.getById(id);
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setBusinessName(BusinessName);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getById(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

    /**
     * 各个状态的订单数量统计
     * @return
     */
    public OrderStatisticsVO getOrderStatistics(Long businessId) {
        Orders orders = new Orders();
        orders.setBusinessId(businessId);

        // 待派送数量
        orders.setStatus(Orders.CONFIRMED);
        Integer confirmed = orderMapper.countByStatus(orders);
        // 派送中数量
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);
        Integer deliveryInProgress = orderMapper.countByStatus(orders);
        // 待接单数量
        orders.setStatus(Orders.TO_BE_CONFIRMED);
        Integer toBeConfirmed = orderMapper.countByStatus(orders);

        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        return orderStatisticsVO;
    }

    /**
     * 取消订单
     * @param ordersCancelDTO
     * @return
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

        Orders orders = new Orders();
        Integer payStatus = ordersDB.getPayStatus();
        if(payStatus == 1) {
            // 用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal("0.01"),
//                    new BigDecimal("0.01"));
//            log.info("申请退款,{}", refund);
            orders.setPayStatus(Orders.REFUND);
        }

        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 接收订单
     * @param id
     */
    public void confirm(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if(ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为已接单
        orders.setStatus(Orders.CONFIRMED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /**
     * 派送订单
     * @param id
     */
    public void delivery(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在，并且状态为3
        if (ordersDB == null || !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);
    }

    /**
     * 完成订单
     * @param id
     */
    public void complete(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if(ordersDB == null || !ordersDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        // 更新订单状态,状态转为完成
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /**
     * 拒绝订单
     * @param ordersRejectionDTO
     */
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());

        // 订单只有存在且状态为2（待接单）才可以拒单
        if(ordersDB == null || !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }
        Orders orders = new Orders();
        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if(Objects.equals(payStatus, Orders.PAID)) {
            // 用户已支付，需要退款
//            String refund = weChatPayUtil.refund(
//                    ordersDB.getNumber(),
//                    ordersDB.getNumber(),
//                    new BigDecimal("0.01"),
//                    new BigDecimal("0.01"));
//            log.info("申请退款：{}", refund);
            orders.setPayStatus(Orders.REFUND);
        }
        // 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);

        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);
    }



    // C端
    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submit(OrdersSubmitDTO ordersSubmitDTO) {
        // 1.处理各种异常(地址为空，购物车数据为空)
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if(addressBook == null){
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        // 查询当前用户购物车数据
        Long usrId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(usrId);
        shoppingCart.setBusinessId(ordersSubmitDTO.getBusinessId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if(shoppingCartList == null || shoppingCartList.isEmpty()){
            throw new AddressBookBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }
        // 2.向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        // 未支付
        orders.setPayStatus(Orders.UN_PAID);
        // 待付款
        orders.setStatus(Orders.PAID);
        // 订单号，当前系统时间戳
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        // 收货人
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(usrId);
        // 收获地址
        orders.setAddress(addressBook.getDetail());

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();
        // 3.向订单明细表插入数据
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetailList);

        // 4.清空当前用户的购物车数据
        shoppingCartMapper.clear(usrId);

        // 5.封装VO对象
        return OrderSubmitVO
                .builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();
    }

    /**
     * 历史订单查询
     * @param ordersHistoryQueryDTO
     * @return
     */
    public PageResult userOrderHistory(OrdersHistoryQueryDTO ordersHistoryQueryDTO) {
        PageHelper.startPage(ordersHistoryQueryDTO.getPage(), ordersHistoryQueryDTO.getPageSize());

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setStatus(ordersHistoryQueryDTO.getStatus());
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());

        // 分页查询
        Page<Orders> ordersPage = orderMapper.pageQuery(ordersPageQueryDTO);
        List<OrderVO> orderList = new ArrayList<>();

        // 查询出订单明细，并封装入OrderVO进行响应
        if(ordersPage != null || ordersPage.getTotal() > 0){
            for (Orders orders : ordersPage) {
                Long OrderId = orders.getId();
                Long businessId = orders.getBusinessId();
                Business business = businessMapper.getById(businessId);
                String BusinessName = business.getName();
                // 查询订单明细
                List<OrderDetail> orderDetailList = orderDetailMapper.getById(OrderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetailList);
                orderVO.setBusinessName(BusinessName);

                orderList.add(orderVO);
            }
        }
        return new PageResult(ordersPage.getTotal(), orderList);
    }

    /**
     * 查询订单详情
     * @param id
     * @return
     */
    public OrderVO userOrderDetail(Long id) {
        // 查询订单表基础数据
        Orders orders = orderMapper.getById(id);
        if(orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        if(!Objects.equals(orders.getUserId(), BaseContext.getCurrentId())){
            throw new OrderBusinessException(MessageConstant.NOT_PERMISSIONS);
        }

        Long businessId = orders.getBusinessId();
        Business business = businessMapper.getById(businessId);
        String BusinessName = business.getName();

        // 查询订单详情表数据
        List<OrderDetail> orderDetailList = orderDetailMapper.getById(id);
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setBusinessName(BusinessName);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /**
     * 用户取消订单
     * @param id
     */
    public void userCancel(Long id) throws Exception {
        // 查询订单
        Orders ordersDB = orderMapper.getById(id);
        // 订单不存在
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        //订单状态 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (ordersDB.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());

        // 订单处于待接单状态下取消，需要进行退款
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            //调用微信支付退款接口
            weChatPayUtil.refund(
                    ordersDB.getNumber(), //商户订单号
                    ordersDB.getNumber(), //商户退款单号
                    new BigDecimal("0.01"),//退款金额，单位 元
                    new BigDecimal("0.01"));//原订单金额

            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        // 更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 订单支付
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);
//
//        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//                ordersPaymentDTO.getOrderNumber(), //商户订单号
//                new BigDecimal("0.01"), //支付金额，单位 元
//                "星轻食订单", //商品描述
//                user.getOpenid() //微信用户的openid
//        );
//
//        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
//            throw new OrderBusinessException("该订单已支付");
//        }
//
//        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
//        vo.setPackageStr(jsonObject.getString("package"));
        OrderPaymentVO vo = new OrderPaymentVO();
//
//
//        return vo;
        return vo;
    }

    /**
     * 支付成功
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单号查询当前用户的订单
        Orders ordersDB = orderMapper.getByNumberAndUserId(outTradeNo, userId);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //通过websocket向客户端浏览器推送消息 type orderId content
        Map map = new HashMap();
        map.put("type",1); // 1表示来单提醒 2表示客户催单
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号：" + outTradeNo);

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 客户催单
     * @param id
     */
    public void reminder(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        Map map = new HashMap();
        // 2 客户催单
        map.put("type",2);
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号" + ordersDB.getNumber());
        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 再来一单
     * @param id
     */
    public void repetiton(Long id) {
        Orders ordersDB = orderMapper.getById(id);
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getById(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setBusinessId(ordersDB.getBusinessId());
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 删除订单
     * @param id
     */
    @Transactional
    public void delete(Long id) {
        Orders orders = orderMapper.getById(id);
        if(orders == null){
            // 订单不存在
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        orderDetailMapper.delete(id);
        orderMapper.delete(id);
    }

    /**
     * 模拟支付
     * @param ordersPaymentDTO
     * @return
     */
    public void myPayment(OrdersPaymentDTO ordersPaymentDTO) {
        // 订单不存在
        Long userId = BaseContext.getCurrentId();
        Orders order = orderMapper.getByNumberAndUserId(ordersPaymentDTO.getOrderNumber(),userId);
        if(order == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        // 模拟支付成功

        Orders orders = Orders.builder()
                .id(order.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payMethod(ordersPaymentDTO.getPayMethod())
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
        //通过websocket向客户端浏览器推送消息 type orderId content
        Map map = new HashMap();
        map.put("type",1); // 1表示来单提醒 2表示客户催单
        map.put("orderId",orders.getId());
        map.put("content","订单号：" + orders.getNumber());

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }
}
